Same hyperlink works in one JSFiddle, but not in another

I'm trying to create a hyperlink that adds a bookmark when clicked by the user running Firefox.

As you can see, the code works to do so here, as seen in this plain JSFiddle: http://ift.tt/1RwAFrw

i.e., <a href="http://ift.tt/gbk8l4" id="linkclick" title="Stack Overflow" rel="sidebar">Bookmark me test</a>

But when I then cut and paste this very same link over here: http://ift.tt/1KTSGku, then it fails to do anything at all, and no matter where I put it. Why might this be? I've checked Google, and nobody seems to have any input on the matter. Thank you ahead of time for any insight.

Second JSFiddle: i.e., <a href="http://ift.tt/gbk8l4" id="linkclick" title="Stack Overflow" rel="sidebar">Bookmark me test</a>